Internal combustion engine



FIG. 1 is a front elevational view of the internal combustion engine;

FIG. 2 is a rear elevational view of the internal combustion engine;

FIG. 3 is a left side elevational view of the internal combustion engine;

FIG. 4 is a right side elevational view of the internal combustion engine;

FIG. 5 is a top plan view of the internal combustion engine;

FIG. 6 is a bottom plan view of the internal combustion engine; and,

FIG. 7 is a front left perspective view of the internal combustion engine of the present invention.

In the drawings, the broken lines depict unclaimed subject matter only and form no part of the claimed design. 

CLAIM We claim the ornamental design for the internal combustion engine, as shown and described. 